n L4-05: Frequency Reference Loss Detection SelectionThe drive can detect a loss of an analog frequency reference from input A1 or A2. Frequency reference loss is detected whenthe frequency reference drops below 10% of the reference or below 5% of the maximum output frequency within 400 ms.100%400 msAnalogfrequencyreferenceLoss ofReferenceoutput time10%ONOFFFigure 1.65 Loss of Reference FunctionSet H2-01 or H2-02 to C for a digital output to trigger when frequency reference loss occurs. Refer to Setting C: FrequencyReference Loss on page 86 for details on setting the output function.Parameter L4-05 selects the operation when a frequency reference loss is detected.No. Name Setting Range DefaultL4-05 Frequency Reference Loss Detection Selection 0, 1 1Setting 0: StopDrive follows the frequency reference (which is no longer present) and stops the motor.Setting 1: Continue Operation with Reduced Frequency ReferenceThe drive will continue operation at the percent of the previous frequency value set to parameter L4-06. When the externalfrequency reference value is restored, the operation is continued with the frequency reference.n L4-06: Frequency Reference at Reference LossSets the frequency reference level at which the drive runs when L4-05 = 1 and when detecting a reference loss. The value isset as a percentage of the frequency reference before the loss was detected.No. Name Setting Range DefaultL4-06 Frequency Reference at Reference Loss 0.0 to 100.0% 80.0%n L4-07: Speed Agree Detection SelectionDetermines when frequency detection is active using parameters L4-01 through L4-04.No. Name Setting Range DefaultL4-07 Speed Agree Detection Selection 0, 1 0Setting 0: No Detection during baseblockSetting 1: Detection always enabledu L5: Fault RestartAfter a fault has occurred, Fault Restart attempts to automatically restart the motor and continue operation instead of stopping.The drive can perform a self-diagnostic check and resume the operation after a fault has occurred. If the self-check is successfuland the cause of the fault has disappeared, the drive restarts by first performing Speed Search (Refer to b3: Speed Search onpage 31 for details).Note: 1. The wiring sequence should remove the Forward/Reverse command when a fault is triggered and output is shut off.2. When the Forward/Reverse command is removed, the drive can perform a self-diagnostic check and attempt to restart the faultautomatically.WARNING! Sudden Movement Hazard. Do not use the fault restart function in lifting applications. Fault restart may cause the machine todrop the load, which could result in death or serious injury.The drive can attempt to restart itself following the faults listed below.Fault NameGF Ground FaultFault NameLF Output Open Phase1.8 L: Protection FunctionsYASKAWA SIEP YAIZ1U 03B YASKAWA AC Drive – Z1000 Programming Manual 1111 Parameter Details
